Yamaha YZF-R 125 (2009) vs BMW F 800ST (2007)
Comparison technical specifications
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| Make: | Yamaha | BMW |
| Model: | YZF-R 125 | F 800ST |
| Years: | 2009 | 2007 |
| Engine: | Four stroke, single cylinder, SOHC, 4 valve | Four stroke, parallel twin cylinder, DOHC, 4 valves per cylinder |
| Capacity: | 124 cc / 7.6 cu-in | 798 cc / 47.7 cub. in. |
| Bore x Stroke: | 52 × 58.6 mm | 82 x 75.8 mm |
| Cooling System: | Liquid cooled | Liquid cooled |
| Compression Ratio: | 10.4:1 | 12.0:1 |
| Induction: | Fuel Injection | Electronic intake injection |
| Ignition: | TCI | Knock control and oxygen sensors. |
| Starting: | Electric | Electric |
| Max Power: | 12.6 kW / 17 hp @ 8500 rpm | 62.5 kW / 85 hp @ 8000 rpm |
| Max Torque: | 15 Nm / 1.25 kg-m @ 7500 rpm | 80 Nm / 8.16 kgf-m / 59 lb-ft @ 5800 rpm |
| Clutch: | Wet Multiple-disc | Cable-operated multiplate-plate wet clutch |
| Transmission: | 6 Speed | 6 Speed |
| Final Drive: | Chain | Belt drive with shock damper |
| Frame: | Delta box | Bridge-type aluminium frame |
| Front Suspension: | Telescopic forks | ∅43mm Telescopic forks |
| Front Wheel Travel: | 130 mm / 5.1 in | 140 mm / 5.5 in |
| Rear Suspension: | Swinging arm | Die-cast aluminium single sided swinging arm with rear wheal axle and eccentric adjustment, central spring stud , spring pre-loaded hydraulically adjustable to continuously variable levels by means of handwheel, rebound damping adjustable. |
| Rear Wheel Travel: | 125 mm / 4.9 in | 140 mm / 5.5 in |
| Front Brakes: | Single 292mm disc | 2 x ∅320mm discs, 4 piston calipers |
| Rear Brakes: | Single 230mm disc | Single ∅265mm disc, 2 piston caliper |
| Front Tyre: | 90/80 -17 | 120/70 ZR17 |
| Rear Tyre: | 130/70 -17 | 180/55 ZR17 |
| Seat Height: | 810 mm / 31.8 in | 820 mm / 32.2 in (low seat: 790 mm / 31.1 in) |
| Dry Weight: | 127 kg / 279 lbs | 187 kg / 412 lbs |
| Fuel Capacity: | 13.8 Litres / 3.6 gal | 16 L / 4.2 US gal |